Electric heater



FIG. 1 is a perspective view of the electric heater according to the invention;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof, and the right side elevational view is a mirror image of the left side.

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for the electric heater, as shown and described. 